Add vulkan files into skia repo.

third_party/shaderc/shaderc.h

Index: third_party/shaderc/shaderc.h
diff --git a/third_party/shaderc/shaderc.h b/third_party/shaderc/shaderc.h
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+// Copyright 2015 The Shaderc Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef SHADERC_H_
+#define SHADERC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+typedef enum {
+  // Forced shader kinds. These shader kinds force the compiler to compile the
+  // source code as the specified kind of shader.
+  shaderc_glsl_vertex_shader,
+  shaderc_glsl_fragment_shader,
+  shaderc_glsl_compute_shader,
+  shaderc_glsl_geometry_shader,
+  shaderc_glsl_tess_control_shader,
+  shaderc_glsl_tess_evaluation_shader,
+  // Deduce the shader kind from #pragma annotation in the source code. Compiler
+  // will emit error if #pragma annotation is not found.
+  shaderc_glsl_infer_from_source,
+  // Default shader kinds. Compiler will fall back to compile the source code as
+  // the specified kind of shader when #pragma annotation is not found in the
+  // source code.
+  shaderc_glsl_default_vertex_shader,
+  shaderc_glsl_default_fragment_shader,
+  shaderc_glsl_default_compute_shader,
+  shaderc_glsl_default_geometry_shader,
+  shaderc_glsl_default_tess_control_shader,
+  shaderc_glsl_default_tess_evaluation_shader,
+} shaderc_shader_kind;
+
+typedef enum {
+  shaderc_target_env_vulkan,         // create SPIR-V under Vulkan semantics
+  shaderc_target_env_opengl,         // create SPIR-V under OpenGL semantics
+  shaderc_target_env_opengl_compat,  // create SPIR-V under OpenGL semantics,
+                                     // including compatibility profile
+                                     // functions
+  shaderc_target_env_default = shaderc_target_env_vulkan
+} shaderc_target_env;
+
+typedef enum {
+  shaderc_profile_none,  // Used if and only if GLSL version did not specify
+                         // profiles.
+  shaderc_profile_core,
+  shaderc_profile_compatibility,
+  shaderc_profile_es,
+} shaderc_profile;
+
+// Used in the result module (shaderc_spv_module) to indicate the status of an
+// compilation.
+typedef enum {
+  shaderc_compilation_status_success = 0,
+  shaderc_compilation_status_invalid_stage,  // error stage deduction
+  shaderc_compilation_status_compilation_error,
+  shaderc_compilation_status_internal_error, // unexpected failure
+  shaderc_compilation_status_null_result_module,
+} shaderc_compilation_status;
+
+// Usage examples:
+//
+// Aggressively release compiler resources, but spend time in initialization
+// for each new use.
+//      shaderc_compiler_t compiler = shaderc_compiler_initialize();
+//      shader_spv_module_t module = shaderc_compile_into_spv(compiler,
+//                    "int main() {}", 13, shaderc_glsl_vertex_shader, "main");
+//      // Do stuff with module compilation results.
+//      shaderc_module_release(module);
+//      shaderc_compiler_release(compiler);
+//
+// Keep the compiler object around for a long time, but pay for extra space
+// occupied.
+//      shaderc_compiler_t compiler = shaderc_compiler_initialize();
+//      // On the same, other or multiple simultaneous threads.
+//      shader_spv_module_t module = shaderc_compile_into_spv(compiler,
+//                    "int main() {}", 13, shaderc_glsl_vertex_shader, "main");
+//      // Do stuff with module compilation results.
+//      shaderc_module_release(module);
+//      // Once no more compilations are to happen.
+//      shaderc_compiler_release(compiler);
+
+// An opaque handle to an object that manages all compiler state.
+typedef struct shaderc_compiler* shaderc_compiler_t;
+
+// Returns a shaderc_compiler_t that can be used to compile modules.
+// A return of NULL indicates that there was an error initializing the compiler.
+// Any function operating on shaderc_compiler_t must offer the basic
+// thread-safety guarantee.
+// [http://herbsutter.com/2014/01/13/gotw-95-solution-thread-safety-and-synchronization/]
+// That is: concurrent invocation of these functions on DIFFERENT objects needs
+// no synchronization; concurrent invocation of these functions on the SAME
+// object requires synchronization IF AND ONLY IF some of them take a non-const
+// argument.
+shaderc_compiler_t shaderc_compiler_initialize(void);
+
+// Releases the resources held by the shaderc_compiler_t.
+// After this call it is invalid to make any future calls to functions
+// involving this shaderc_compiler_t.
+void shaderc_compiler_release(shaderc_compiler_t);
+
+// An opaque handle to an object that manages options to a single compilation
+// result.
+typedef struct shaderc_compile_options* shaderc_compile_options_t;
+
+// Returns a default-initialized shaderc_compile_options_t that can be used
+// to modify the functionality of a compiled module.
+// A return of NULL indicates that there was an error initializing the options.
+// Any function operating on shaderc_compile_options_t must offer the
+// basic thread-safety guarantee.
+shaderc_compile_options_t shaderc_compile_options_initialize(void);
+
+// Returns a copy of the given shaderc_compile_options_t.
+// If NULL is passed as the parameter the call is the same as
+// shaderc_compile_options_init.
+shaderc_compile_options_t shaderc_compile_options_clone(
+    const shaderc_compile_options_t options);
+
+// Releases the compilation options. It is invalid to use the given
+// shaderc_compile_options_t object in any future calls. It is safe to pass
+// NULL to this function, and doing such will have no effect.
+void shaderc_compile_options_release(shaderc_compile_options_t options);
+
+// Adds a predefined macro to the compilation options. This has the
+// same effect as passing -Dname=value to the command-line compiler.
+// If value is NULL, it has the effect same as passing -Dname to the
+// command-line compiler. If a macro definition with the same name has
+// previously been added, the value is replaced with the new value.
+// The null-terminated strings that the name and value parameters point to
+// must remain valid for the duration of the call, but can be modified or
+// deleted after this function has returned.
+void shaderc_compile_options_add_macro_definition(
+    shaderc_compile_options_t options, const char* name, const char* value);
+
+// Sets the compiler mode to generate debug information in the output.
+void shaderc_compile_options_set_generate_debug_info(
+    shaderc_compile_options_t options);
+
+// Sets the compiler mode to emit a disassembly text instead of a binary. In
+// this mode, the byte array result in the shaderc_spv_module returned
+// from shaderc_compile_into_spv() will consist of SPIR-V assembly text.
+// Note the preprocessing only mode overrides this option, and this option
+// overrides the default mode generating a SPIR-V binary.
+void shaderc_compile_options_set_disassembly_mode(
+    shaderc_compile_options_t options);
+
+// Forces the GLSL language version and profile to a given pair. The version
+// number is the same as would appear in the #version annotation in the source.
+// Version and profile specified here overrides the #version annotation in the
+// source. Use profile: 'shaderc_profile_none' for GLSL versions that do not
+// define profiles, e.g. versions below 150.
+void shaderc_compile_options_set_forced_version_profile(
+    shaderc_compile_options_t options, int version, shaderc_profile profile);
+
+// To support file inclusion, libshaderc invokes a callback into its client to
+// resolve the full path and content of the included file.
+// The client callback should follow the specified function signature below, and
+// it should be passed to libshaderc through the corresponding setter function.
+// When the including of a file is done, libshaderc will call another client
+// callback to clean up the resources used for the including process. The client
+// should implement the clean up method and pass it to libshaderc together with
+// the response method.
+
+// The struct that contains the information to be returned to the libshaderc.
+// The client-side implemented response method should return a pointer of this
+// struct. The underlying data is owned by client code.
+struct shaderc_includer_response {
+  const char* path;
+  size_t path_length;
+  const char* content;
+  size_t content_length;
+};
+
+// The function signature of the client-side implemented response method. It
+// returns a pointer to shaderc_includer_response struct.
+typedef shaderc_includer_response* (*shaderc_includer_response_get_fn)(
+    void* user_data, const char* filename);
+
+// The function signature of the client-side implemented clean-up method.
+// Includer will call this callback function when the including process is done
+// with the fullpath and content data.
+typedef void (*shaderc_includer_response_release_fn)(
+    void* user_data, shaderc_includer_response* data);
+
+// Sets the callback functions for the includer. When the includer queries for
+// the full path and content of a file, client's method will be called to
+// response. And when the query is done, client will be notified to clean up.
+// TODO: File inclusion needs to be context-aware.
+// e.g.
+//  In file: /path/to/main_shader.vert:
+//  #include "include/a"
+//  In file: /path/to/include/a":
+//  #include "b"
+//  When compiling /path/to/main_shader.vert, the compiler should be able to
+//  go to /path/to/include/b to find the file b.
+//  This needs context info from compiler to client includer, and may needs
+//  interface changes.
+void shaderc_compile_options_set_includer_callbacks(
+    shaderc_compile_options_t options, shaderc_includer_response_get_fn getter,
+    shaderc_includer_response_release_fn releasor, void* user_data);
+
+// Sets the compiler mode to do only preprocessing. The byte array result in the
+// module returned by the compilation is the text of the preprocessed shader.
+// This option overrides all other compilation modes, such as disassembly mode
+// and the default mode of compilation to SPIR-V binary.
+void shaderc_compile_options_set_preprocessing_only_mode(
+    shaderc_compile_options_t options);
+
+// Sets the compiler mode to suppress warnings, overriding warnings-as-errors
+// mode. When both suppress-warnings and warnings-as-errors modes are
+// turned on, warning messages will be inhibited, and will not be emitted
+// as error messages.
+void shaderc_compile_options_set_suppress_warnings(
+    shaderc_compile_options_t options);
+
+// Sets the target shader environment, affecting which warnings or errors will
+// be issued.  The version will be for distinguishing between different versions
+// of the target environment.  "0" is the only supported version at this point
+void shaderc_compile_options_set_target_env(shaderc_compile_options_t options,
+                                            shaderc_target_env target,
+                                            uint32_t version);
+
+// Sets the compiler mode to treat all warnings as errors. Note the
+// suppress-warnings mode overrides this option, i.e. if both
+// warning-as-errors and suppress-warnings modes are set, warnings will not
+// be emitted as error messages.
+void shaderc_compile_options_set_warnings_as_errors(
+    shaderc_compile_options_t options);
+
+// An opaque handle to the results of a call to shaderc_compile_into_spv().
+typedef struct shaderc_spv_module* shaderc_spv_module_t;
+
+// Takes a GLSL source string and the associated shader kind, input file
+// name, compiles it according to the given additional_options. If the shader
+// kind is not set to a specified kind, but shaderc_glslc_infer_from_source,
+// the compiler will try to deduce the shader kind from the source
+// string and a failure in deducing will generate an error. Currently only
+// #pragma annotation is supported. If the shader kind is set to one of the
+// default shader kinds, the compiler will fall back to the default shader
+// kind in case it failed to deduce the shader kind from source string.
+// The input_file_name is a null-termintated string. It is used as a tag to
+// identify the source string in cases like emitting error messages. It
+// doesn't have to be a 'file name'.
+// By default the source string will be compiled into SPIR-V binary
+// and a shaderc_spv_module will be returned to hold the results of the
+// compilation. When disassembly mode or preprocessing only mode is enabled
+// in the additional_options, the source string will be compiled into char
+// strings and held by the returned shaderc_spv_module.  The entry_point_name
+// null-terminated string defines the name of the entry point to associate
+// with this GLSL source. If the additional_options parameter is not NULL,
+// then the compilation is modified by any options present. May be safely
+// called from multiple threads without explicit synchronization. If there
+// was failure in allocating the compiler object NULL will be returned.
+shaderc_spv_module_t shaderc_compile_into_spv(
+    const shaderc_compiler_t compiler, const char* source_text,
+    size_t source_text_size, shaderc_shader_kind shader_kind,
+    const char* input_file_name, const char* entry_point_name,
+    const shaderc_compile_options_t additional_options);
+
+// The following functions, operating on shaderc_spv_module_t objects, offer
+// only the basic thread-safety guarantee.
+
+// Releases the resources held by module.  It is invalid to use module for any
+// further operations.
+void shaderc_module_release(shaderc_spv_module_t module);
+
+// Returns true if the result in module was a successful compilation.
+bool shaderc_module_get_success(const shaderc_spv_module_t module);
+
+// Returns the number of bytes in a SPIR-V module result string. When the module
+// is compiled with disassembly mode or preprocessing only mode, the result
+// string is a char string. Otherwise, the result string is binary string.
+size_t shaderc_module_get_length(const shaderc_spv_module_t module);
+
+// Returns the number of warnings generated during the compilation.
+size_t shaderc_module_get_num_warnings(const shaderc_spv_module_t module);
+
+// Returns the number of errors generated during the compilation.
+size_t shaderc_module_get_num_errors(const shaderc_spv_module_t module);
+
+// Returns the compilation status, indicating whether the compilation succeeded,
+// or failed due to some reasons, like invalid shader stage or compilation
+// errors.
+shaderc_compilation_status shaderc_module_get_compilation_status(
+    const shaderc_spv_module_t);
+
+// Returns a pointer to the start of the SPIR-V bytes, either SPIR-V binary or
+// char string. When the source string is compiled into SPIR-V binary, this is
+// guaranteed to be castable to a uint32_t*. If the source string is compiled in
+// disassembly mode or preprocessing only mode, the pointer will point to the
+// result char string.
+const char* shaderc_module_get_bytes(const shaderc_spv_module_t module);
+
+// Returns a null-terminated string that contains any error messages generated
+// during the compilation.
+const char* shaderc_module_get_error_message(const shaderc_spv_module_t module);
+
+// Provides the version & revision of the SPIR-V which will be produced
+void shaderc_get_spv_version(unsigned int* version, unsigned int* revision);
+
+// Parses the version and profile from a given null-terminated string
+// containing both version and profile, like: '450core'. Returns false if
+// the string can not be parsed. Returns true when the parsing succeeds. The
+// parsed version and profile are returned through arguments.
+bool shaderc_parse_version_profile(const char* str, int* version,
+                                   shaderc_profile* profile);
+
+#ifdef __cplusplus
+}
+#endif  // __cplusplus
+
+#endif  // SHADERC_H_